The active site of nitrogenase is a cofactor that contains two ...

[misspop]

The active site of nitrogenase is a cofactor that contains two transition metals. These transition metals are ________.
 
  A) Cr and Mg
  B) Mn and V
  C) Os and Ir
  D) Fe and Zn
  E) Fe and Mo

Question 2

The atomic number indicates ________.
 
  A) the number of neutrons in a nucleus
  B) the total number of neutrons and protons in a nucleus
  C) the number of protons or electrons in a neutral atom
  D) the number of atoms in 1 g of an element
  E) the number of different isotopes of an element

[blakeserpa]

Answer to Question 1

E

Answer to Question 2

C